例句：
A guard was posted outside the building.
建筑物外設了一名警衛。
You can't let your guard down.
你不能掉以輕心。
He was upgraded to security guard.
他被提升為保安。
2024-09-18
例句：
A guard was posted outside the building.
建筑物外設了一名警衛。
You can't let your guard down.
你不能掉以輕心。
He was upgraded to security guard.
他被提升為保安。